The initial support for LDPT_GET_VIEW

The initial support for LDPT_GET_VIEW

This patch adds the initial support for LDPT_GET_VIEW.

ld/

	PR ld/17878
	* plugin.c (tv_header_tags(): Add LDPT_GET_VIEW.
	(get_view): New function.
	(set_tv_header): Handle LDPT_GET_VIEW.
	* testplug.c (tag_names): Add LDPT_GET_VIEW.
	(tv_get_view): New.
	(dump_tv_tag): Handle LDPT_GET_VIEW.
	(parse_tv_tag): Likewise.

ld/testsuite/

	PR ld/17878
	* ld-plugin/plugin-1.d: Add LDPT_GET_VIEW.
	* ld-plugin/plugin-10.d: Likewise.
	* ld-plugin/plugin-11.d: Likewise.
	* ld-plugin/plugin-2.d: Likewise.
	* ld-plugin/plugin-3.d: Likewise.
	* ld-plugin/plugin-4.d: Likewise.
	* ld-plugin/plugin-5.d: Likewise.
	* ld-plugin/plugin-6.d: Likewise.
	* ld-plugin/plugin-7.d: Likewise.
	* ld-plugin/plugin-8.d: Likewise.
	* ld-plugin/plugin-9.d: Likewise.